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DA Case Study: Dade County

DA Case Study: Dade County. Wang YU 5/15/2002. Background. Demand Forecast: (Time zero is June 2, 1976) Early 1970s, 4200 tons solid waste daily. By 1990, 8400 tons solid waste daily. Population: 1.3M Current Situation: Landfill sites are scarce, expensive and unreliable.

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DA Case Study: Dade County

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  1. DA Case Study: Dade County Wang YU 5/15/2002

  2. Background • Demand Forecast: (Time zero is June 2, 1976) • Early 1970s, 4200 tons solid waste daily. • By 1990, 8400 tons solid waste daily. • Population: 1.3M • Current Situation: • Landfill sites are scarce, expensive and unreliable. • Incineration is subject to environmental issues.

  3. Objectives • Capacity: • 2800 tons per day or 18000 tons per week • Economy: • The cheaper, the better. • Environment: • Air. • Recycling of usable refuse.

  4. Discovery of Alternatives • First round of RFP( Request for Proposals) • A technically feasible but innovative alternative is available, provided the county is willing to share some risk. • Net disposal cost from private industry will be competitive, if future regulatory requirements being taken into consideration. • It’s profitable to build an electricity generation station and sell electricity and steam.

  5. Preference • Financial Issues: • The contractor is asked to financing the construction. • Risk Issues: • Less risk and more option. • Engineering Issues: • Resource recovery effectiveness, system controllability and flexibility, plant safety and environment issues.

  6. Influence Diagram • The influence diagram is shown in the DPL document. • Basically, there are two costs: construction cost and operation cost. Three kinds of uncertainties: Regulatory uncertainties, Technical uncertainties, and material price uncertainties.

  7. Event Trees. • As shown in the DPL documents. • Here the decision was made already( Selection of Black Clawson), and the framework of the contract was agreed by both parities.

  8. Conclusion • This case

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